Tag: coal and its products

There are four different types of coal

Peat is the first stage in the formation of coal. The heat and pressure from the top layers convert dead plants into a spongy brown material called peat.

High grade (HG) and ultra high grade (UHG) anthracite are the highest grades of anthracite coal. 

They are the purest forms of coal, having the highest degree of coalification, the highest carbon count and energy content and the fewest impurities (moisture, ash and volatiles).

Anthracite contains nearly 95% of carbon and is the purest form of coal so anthracite is the purest form of coal than any other forms.

Therefore, option B is correct.

Anthracite coal has highest amount of carbon and has clean burning properties. So, it is used as a household coal.

For a process to be spontaneous at all temperatures, the Gibbs free energy change (delta G = delta H - T*delta S) must be negative. This occurs when delta H is negative (exothermic) and delta S is positive (increase in entropy).

Anthracite has the highest percentage of carbon. Anthracite is the most metamorphosed type of coal (but still represents low-grade metamorphism), in which the carbon content is between 92.1% and 98%.

Bituminous coal is a dense sedimentary rock, usually black which is used primarily as household coal ,fuel in steam-electric power generation and to produce coke.

Peat found in the lowest depth of earth considering the other forms of coal.It also has the lowest percentage of carbon as compared to other forms.In other words, we can say that they are the youngest fossils.